Earnings and Dividends Per Share (Summary Of Calculation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
Earnings Per Share [Abstract] | |||||||||||
Net income attributable to common stockholders | $ 37,798 | $ 39,092 | $ 38,245 | $ 44,230 | $ 41,188 | $ 33,032 | $ 44,595 | $ 32,725 | $ 159,365 | $ 151,540 | $ 148,862 |
BASIC: | |||||||||||
Weighted Average Number of Shares Outstanding, Basic | 41,532,130 | 41,108,699 | 40,982,244 | 39,953,804 | 39,847,860 | 39,283,919 | 38,520,221 | 38,401,647 | 40,894,219 | 39,013,412 | 37,604,594 |
Net income per common share attributable to common stockholders | $ 0.91 | $ 0.95 | $ 0.93 | $ 1.11 | $ 1.03 | $ 0.84 | $ 1.16 | $ 0.85 | $ 3.90 | $ 3.88 | $ 3.96 |
DILUTED: | |||||||||||
Weighted average common shares outstanding, diluted | 40,894,219 | 39,013,412 | 37,604,594 | ||||||||
Stock options, diluted | 67,703 | 52,497 | 34,842 | ||||||||
Convertible subordinated debentures | 189,531 | 89,471 | 4,735 | ||||||||
Average dilutive common shares outstanding | 41,803,615 | 41,448,263 | 41,245,173 | 40,108,762 | 39,993,445 | 39,651,900 | 38,561,384 | 38,414,791 | 41,151,453 | 39,155,380 | 37,644,171 |
Net income per common share attributable to common stockholders | $ 0.90 | $ 0.94 | $ 0.93 | $ 1.10 | $ 1.03 | $ 0.83 | $ 1.16 | $ 0.85 | $ 3.87 | $ 3.87 | $ 3.95 |
Incremental shares excluded since anti-dilutive: | |||||||||||
Stock options with an exercise price in excess of the market price for our common shares | 573 | 6,366 | 51,603 | ||||||||
Common Stock, Dividends, Per Share, Declared, Regular | $ 3.80 | $ 3.60 | $ 3.40 |